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Two types of noise are addressed in this procedure, multipath and fading noise. The frequency
of FM waves is extremely high. This makes them susceptible to effects from geological formations
and buildings. These effects disrupt the broadcast signal and obstruct reception in many ways.
- Multipath noise is the echo that occurs when the broadcast signal is reflected by
a large obstruction and enters the receiver with a slight time delay relative to the direct
signal (repetitious buzzing).
- A fading or buzzing noise may occur when the broadcast beam is disrupted by obstructing objects
and the signal strength fluctuates within a narrow range.
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